EV Range: 29; MPG-e: 103; MPG-gas: 40; Base Price: $36,105. The fuel economy leader in the line, the Kia Optima Plug-in Hybrid performs admirably, and while it’s over $4,200 costlier than the standard Optima Hybrid, unlike that model it’s eligible for a $4,919 federal tax credit. We don’t have EPA ratings as of this writing for the redesigned 2018 version of this model’s equivalent, the Hyundai Sonata Plug-In Hybrid, but we expect it to deliver similar numbers to the Optima given here.